Adjustable trestle



J. M. GHAMPLIN.

ADlUSABLE TRESTLE.

APPLICATION man MAY?. 1919.

Patented J an. 27, 1920.

JAMES 1V.[. CI-IAMPLIN, OF SUTI-I C OVENTRY, CONNECTICUT.

ADJUSTABLE TRESTLE.

i Specification of Letters Patent.

Patented Jan. 27, 1920.

Application fue@ nay 7, 1919. serial No. 295,352.

To all whom it may concern.'

Be it known that I, JAMES M. CHAMPLIN, a citizen of the United States, residing at South Coventry, in the county of Tolland and State of Connecticut, have invented a new and useful Improvement in Adjustable Trestles; and I do hereby declare the following, when taken in connection with the `accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in-

Figure 1 an inside view of a trestle constructed in accordance with my invention with the diagonal braces broken away.

Fig. 2 a side view showing the trestle in its depressed position and indicated as supporting a plank.

Fig. 3' an enlarged sectional view of the guide and ,support showing the yoke secured to the lower end of the support.

This invention relates to an improvement in adjustable trestles such as commonly used by carpenters and masons in the erection ot' buildings, and the invention particularly relates to an improvement in trestles which are provided with means for vertical adjustment without separating the lower ends of the legs, the object of the invention being a simple arrangement of parts whereby an adjustable trestle is provided which when the parts are elevated will be firmly held in place; and the invention consists in certain details of construction as will be hereinafter described and particularly recited in the claims.

These trestles are commonly used in pairs and are adapted to support a piece of planking upon which boards may rest to form a platform for the workmen. As herein shown each trestle consists of two legs 5 and 6 .connected together near their lower ends by a transverse stay 7. The upper ends of the legs are connected by yokes 8 and 9, and between the upper ends and extending down therefrom and secured to the stay 7 is a vertical guide 10 formed in its front face with a channel 11 to receive a tongue 12 formed on the outer face of a vertical support 13 which rides between the vertical guide 10 and the yokes 9 and 10. This support is formed with a longitudinal slot 15 to give clearance for a bolt 16 mounted in the vertical guide 10 over the end of which bolt a wing nut 17 may be turned so as to clamp to the outer and inner faces of the support 13 at itsv upper end are cross bars 14 and pivotally connected with the ends of'these cross bars are stays 18 and 19. 'Ihese stays are preferably formed from wood outwardly curvedat their lower ends. To the upper ends of the stays, straps 20 are applied, these straps forming eyes 21 through which rivets 22 extend and by which the stays are hinged `above the upper end of the support 13 are plates r27and 28 between which a piece of planking 29 may be placed and held by a set screw 30. Secured to the lower end of the support 13 is a yoke 31 the ends of which are turned inward over the outer face of the guide 10 so as to hold the support and guide together and projecting outward from this yoke are arms 32 and 33 between which is pivoted a brace 34 which is provided at its upper end with a clip 35 adapted to be 'engaged with a plank 29, this brace standing at an angle of about 45 to the legs so as to provide a firm supportfor the plank. To adjust the trestle the wing nuts 26 and 17 are loosened on their bolts so as to permit the support 13 to be raised to the desired extent, and when adjusted these nuts are turned upon their screws so as to lirmly clamp the support 13 to the guide 18 and the lower ends of the stays 18 and 19 are firmly connected to the legs.

It will be noted that inasmuch as thc inclined legs of the trestle are rigidly secured together, the distance of the trestle from the wall remains the same in any adjustment of it, whereas trestles having adjustable legs are varied in position with respect to the work every time their legs are adj usted, which is often very inconvenient.

I claim 1. A trestle comprising a pair of legs, yokes connected with the Lipper ends of the legs, a vertical guideway mounted between said legs and supported thereby, a vertical movable support, means for adjustably connecting the said support with the gudeway,

`the support 13 to the guide 10. Secured a cross bar connected with the upper end of said support, stays pivotally connected with the ends oi said cross bar, and means for adjustably connecting the lower ends of the said stays with said legs.

2. A trestle having a pair of inclined legs rigidly connected together, a vertically movable support mounted between the same, a pair of depending, spreading braces respectively located adjacent to the said legs, means for pivotally connecting the upper ends of the said braces with the projecting upper end of the said support, and mean: for adjustably connecting the lower ends of the said braces to the Said legs, whereby the braces are raised and lowered with the support without disturbing the legs.

3. A trestle comprising a pair of inclined legs rigidly secured together', a vertically movable support mounted between the said legs, a cross-piece carried by the projecting upper end of the support, a pair of depend ing, spreading braces pivotally connected at their upper ends with the respective ends of the said cross-piece, and means for adjustably connecting the lower ends of the said braces with the legs, whereby the support and braces are raised and lowered together while the legs remain iixed in position.

Il. A trestle having a pair of inclined legs rigidly secured together, a guide-way rigidly mounted between the said legs, a vertically movable support applied to the said guide way and projecting above the said legs, a pair of depending, spreading braces pivotally connected at their upper ends with the projecting upper end or the said support, and means for adjustably connecting the lower ends of the said braces with the said legs.

5. A trestle comprising a pair ofy legs, yolres connecting the upper ends of the legs, a vertical guideway mounted between said legs and supported thereby, a vertically movable support, means for adjustably connecting the said support with the guideway, a cross bar connected to the upper end of the said support, stays pivotally connected with the ends of said cross bar, the lower ends of the said stays outwardly curved, straps extending over the lower ends of said stays, and means for adj ustably connecting the lower ends of the stays with said legs.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

l JAMES M. CHAMPLN. Witnesses GEORGE A. COUR, Gr. M. BEEBE. 

